KR100887534B1 - Apparatus for cooling Zn-Al alloy hot-dip plated steel sheet - Google Patents
Apparatus for cooling Zn-Al alloy hot-dip plated steel sheet Download PDFInfo
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- KR100887534B1 KR100887534B1 KR1020070059743A KR20070059743A KR100887534B1 KR 100887534 B1 KR100887534 B1 KR 100887534B1 KR 1020070059743 A KR1020070059743 A KR 1020070059743A KR 20070059743 A KR20070059743 A KR 20070059743A KR 100887534 B1 KR100887534 B1 KR 100887534B1
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- 238000001816 cooling Methods 0.000 title claims abstract description 77
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 30
- 239000010959 steel Substances 0.000 title claims abstract description 30
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 11
- 239000000956 alloy Substances 0.000 title claims abstract description 11
- 229910007570 Zn-Al Inorganic materials 0.000 title 1
- 238000007747 plating Methods 0.000 claims abstract description 21
- 229910000611 Zinc aluminium Inorganic materials 0.000 claims abstract description 10
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910001335 Galvanized steel Inorganic materials 0.000 claims abstract description 7
- 239000008397 galvanized steel Substances 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 9
- 239000011521 glass Substances 0.000 abstract 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 10
- 229910052725 zinc Inorganic materials 0.000 description 10
- 239000011701 zinc Substances 0.000 description 10
- 238000005260 corrosion Methods 0.000 description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 8
- 230000007797 corrosion Effects 0.000 description 8
- 239000007789 gas Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- -1 zinc Chemical compound 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
- C23C2/29—Cooling or quenching
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/12—Aluminium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/50—Controlling or regulating the coating processes
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Abstract
본 발명은 아연-알루미늄 합금 용융도금강판의 냉각장치로서 상하 냉각헤드의 차등구조와 폭 방향 풍량제어가 가능한 방식을 적용하여 전이면 및 폭방향으로 균일한 스팽글을 가지는 아연-알루미늄 합금 용융도금강판(이하 GL강판으로 약칭)을 제조하기 위한 냉각장치에 관한 것이다.The present invention is a zinc-aluminum alloy hot-dip galvanized zinc-aluminum alloy hot-dip galvanized steel sheet having a uniform sequins in the front and the width direction by applying the differential structure of the upper and lower cooling head and the method of controlling the air volume in the width direction. Hereinafter, a cooling device for manufacturing the abbreviated name GL glass.
도금욕조를 통과한 GL강판을 급속 냉각할 수 있도록 본 발명은 상하 구분된 노즐헤드를 장착한 개방형 냉각장치를 기본으로, 도금직후 라운드형 노즐에 의한 폭방향 냉각속도 차이가 발생하지 않도록 스트레이트 형 노즐을 우선적용하되, 상기 냉각대의 수직방향으로 배열된 다수의 냉각헤드에 공급되는 가스 유입구를 전이면 각기 폭방향으로 3등분하고, 전이면 각 3등분한 도관 내에 설치한 제어밸브를, 냉각대에 설치한 카메라로 피드백 받은 판의 치우침에 따라, 중앙운전실에서 적절하게 제어함으로써 폭방향으로 균일한 스팽글을 가지는 GL강판을 제조할 수 있게 된다.In order to rapidly cool the GL steel sheet passing through the plating bath, the present invention is based on an open-type cooling device equipped with nozzle heads divided up and down. The control valves installed in the conduits divided into three equal parts in the width direction of the gas inlets supplied to the plurality of cooling heads arranged in the vertical direction of the cooling table, and in the three equal parts in the front part, are applied to the cooling table. According to the bias of the plate fed back by the installed camera, it is possible to manufacture a GL steel sheet having a uniform sequin in the width direction by appropriately controlling it in the central cab.
아연-알루미늄 합금 용융도금강판, 냉각대, 스팽글 Zinc-aluminum alloy hot-dip galvanized steel sheet, cooling stand, sequins
Description
도1은 아연-알루미늄 합금 용융도금공정의 기본도1 is a basic diagram of a zinc-aluminum alloy hot dip plating process
도2는 본 발명품을 적용하지 않았을 경우 생성되는 판 치우침 현상Figure 2 is a plate skew phenomenon generated when the present invention is not applied
도3은 본 발명의 냉각장치도Figure 3 is a cooling device of the present invention
도4는 냉각장치 헤드의 구조설명도4 is a structural diagram of a cooling device head
도5는 제어체계도.5 is a control system diagram.
S.스트립, 1.급속냉각장치 2.스나우트, 3.용융도금욕조, 4.침지롤,S. strip, 1.quick cooling system 2.snaut, 3.hot dip bath, 4.immersion roll,
5.가스 와이핑장치, 6.급속냉각대, 7.균열대(GA용), 8.냉각대5.Gas wiping device, 6.Rapid cooler, 7.Cracker (for GA), 8.Cooler
9.냉각팬, 10a~10c.냉각박스(a:작업측,b:중앙,c:구동측). 9. Cooling fan, 10a to 10c. Cooling box (a: working side, b: center, c: driving side).
11a~c.풍량조절밸브(a:작업측,b:중앙,c:구동측), 12.메인풍량조절밸브, 11a ~ c. Air flow control valve (a: working side, b: center, c: driving side), 12. main air flow control valve,
13.하부 냉각헤드, 14.하부 냉각노즐, 15.상부 냉각헤드, 16.상부 냉각노즐13. Lower cooling head, 14. Lower cooling nozzle, 15. Upper cooling head, 16. Upper cooling nozzle
17.카메라17.Camera
본 발명은 아연-알루미늄 합금 용융도금강판 등의 도금강판용 냉각제어장치에 관한 것이다.The present invention relates to a cooling control device for a plated steel sheet such as a zinc-aluminum alloy hot dip plated steel sheet.
이는 상하 냉각헤드의 차등구조와 폭방향 풍량제어가 가능한 방식을 적용하여 전이면 및 폭방향으로 균일한 스팽글을 가지는 아연-알루미늄 합금 용융도금강판(이하 "GL강판"으로 약칭)을 제조하도록 하는데 목적이 있다.The purpose is to produce a zinc-aluminum alloy hot-dip galvanized steel sheet (hereinafter abbreviated as "GL steel sheet") having uniform sequins in the front and back and width directions by applying the differential structure of the upper and lower cooling heads and the method of controlling the air volume in the width direction. There is this.
본 발명상의 냉각제어 장치는 도금욕조를 통과한 GL강판을 급속 냉각할 수 있도록 본 발명은 상하 구분된 노즐헤드를 장착한 개방형 냉각장치를 기본으로 하고, 도금 직후 라운드형 노즐에 의한 폭방향 냉각속도 차이가 발생하지 않도록 스트레이트 형 노즐을 우선적으로 적용하되, 상기 냉각대의 수직방향으로 배열된 다수의 냉각헤드에 공급되는 가스 유입구를 전이면 각기 폭방향으로 3등분하고, 전이면 각 3등분한 도관 내에 설치한 제어밸브를, 냉각대에 설치한 카메라로 피드백 받은 판의 치우침에 따라, 중앙운전실에서 적절하게 제어함으로써 폭방향으로 균일한 스팽글을 가지는 GL강판을 제조할 수 있도록 한 도금강판의 냉각제어 방법 및 장치에 관한 것이다.In the present invention, the cooling control device of the present invention is based on an open type cooling device equipped with nozzle heads divided up and down so as to rapidly cool the GL steel sheet passing through the plating bath, and the widthwise cooling rate by the round type nozzle immediately after plating. In order to prevent a difference, a straight nozzle is preferentially applied, but the gas inlets supplied to the plurality of cooling heads arranged in the vertical direction of the cooling stand are divided into three equal parts in the width direction of the front part, and each three equal parts in the conduit. Cooling control method of plated steel sheet, which makes it possible to manufacture GL steel sheet with uniform sequins in the width direction by appropriately controlling the installed control valve in the center cab according to the bias of the plate fed back to the camera mounted on the cooling table. And to an apparatus.
아연-알루미늄 합금 용융도금강판(GL강판)은 도금층 내에 아연과 알루미늄상이 분산된 형태로 조성됨으로써 아연의 희생방식기능과 알루미늄의 장벽기능을 복합적으로 발휘하여 우수한 나내식성을 가지는 강판이다. 이러한 내식성능을 확보하기 위하여서는 예컨데 55wt%Al-43.4wt%Zn-1.6wt%Si으로 조성된 도금욕에서 용융도금을 행하고, 욕조를 통과하는 강판에 딸려 올라오는 도금층을 가스 와이핑(Gas Wiping) 장치로 깎아내어 요구 부착량으로 조절한 후 강제냉각방식의 급속냉각을 행하여야 한다.Zinc-aluminum alloy hot-dip galvanized steel sheet (GL steel sheet) is a steel sheet having excellent corrosion resistance by combining the sacrificial anticorrosion function of zinc and the barrier function of aluminum by forming a zinc and aluminum phase dispersed in the plating layer. In order to secure such corrosion resistance, for example, hot-dip plating is performed in a plating bath composed of 55 wt% Al-43.4 wt% Zn-1.6 wt% Si, and gas wiping is performed on the plating layer that comes with the steel sheet passing through the bath. After cutting by the device and adjusting to the required amount of attachment, rapid cooling by forced cooling method should be performed.
도금 직후 급속 냉각을 하는 목적은 도금층 내부에 냉각에 의해 형성되는 아연과 알루미늄 상이 고르게 분포되도록 하여 우수한 내식성을 확보하기 위한 것이다. 이때 냉각에 의해 생성되는 스팽글이 표면의 외관을 결정하는 요인이 되므로 내식성과 외관품질을 좌우하게 된다. 일반적으로 스팽글의 크기는 급냉시간, 풍량, 강판 및 욕의 온도 등에 따라 영향을 받게 된다. The purpose of rapid cooling immediately after plating is to ensure an excellent corrosion resistance by uniformly distributing the zinc and aluminum phases formed by cooling in the plating layer. At this time, since the sequins generated by cooling become a factor in determining the appearance of the surface, corrosion and appearance quality are influenced. In general, the size of the sequins is affected by the quenching time, the air flow rate, the temperature of the steel sheet and the bath.
냉각속도가 빨라지면 스팽글 핵의 성장이 억제되어 미세화되는데 현재의 냉각대 설비는 외부로부터 찬공기를 공급받아 강판에 분사하는 체계로 이루어져 있어 분사된 냉각공기가 강판이 가지는 열을 흡수하여 다시 배출될 수 있도록 개방형 냉각헤드를 적용하고 있다.As the cooling speed increases, the growth of the sequin nucleus is suppressed and refined. The current cooling stage equipment is composed of a system that receives cold air from the outside and sprays it onto the steel sheet, so that the injected cooling air absorbs the heat of the steel sheet and is discharged again. An open cooling head is applied to ensure this.
하지만 가스 와이핑 직후에 이 냉각대에서 급속한 강제냉각을 행하는 과정에서 GL강판은 전이면으로 치우치거나 폭방향으로 흔들리는 현상이 발생 되므로 인해 폭방향, 또는 전이면으로 상이한 스팽글이 만들어지는 문제를 안고 있다.However, during the forced forced cooling of the cooling zone immediately after the gas wiping, the GL steel is biased toward the front and back sides, causing the sequins to be formed in the width direction or the front side. have.
일반적으로 스팽글과 도금층 내의 아연 및 알루미늄 상의 분산정도는 반비례하는 관계를 나타내기 때문에 스팽글이 크면 아연상(Zinc rich phase)과 알루미늄상(Aluminum rich phase)이 고르게 분산된 네트워크 상을 형성하지 못하고 아연상과 알루미늄상이 번갈아 관찰되는 기둥형(Column) 도금조직을 만들어 내게된다. 즉, 아연과 알루미늄이 가지는 방식성능이 동시에 발휘됨에 따른 상승효과를 기대할 수 없어 원하는 수준의 내식성을 얻을 수 없게 된다. 도금 중 전이면 및 폭방향으로 동일한 풍량이 분사된다고 하더라도 냉각대를 진행하는 GL강판이 흔들리거나 한쪽으로 치우치게 되면 냉각속도에 차이가 발생하게 되고 이는 전이면 간, 또는 폭방향 중앙과 선단부 간의 스팽글 편차를 유발시켜 특정면이나 폭방향 특정 부위의 내식성을 저하시키게 된다. In general, since the degree of dispersion of the zinc and aluminum phases in the sequins and the plating layer is inversely related, a large sequin does not form a network phase in which the zinc rich phase and the aluminum rich phase are evenly dispersed and the zinc phase It produces a columnar plating structure where alternating and aluminum phases are observed. In other words, the synergistic effect of the anti-corrosion performance of zinc and aluminum can not be expected at the same time to obtain the desired level of corrosion resistance. Even if the same amount of air is sprayed in the front and width directions during plating, the difference in cooling rate occurs when the GL steel sheet that passes through the cooling table is shaken or biased to one side. By reducing the corrosion resistance of the specific surface or the specific area in the width direction.
한편, 도금 후 냉각공정에서의 판흔들림을 방지하기 위하여 종래에는 정압패드가 고안되어 적용되고 있으나 판의 흔들림을 교정할 정도의 효과를 내지 못하여 최근에는 전자기력을 이용한 판안정화 장치가 개발되었다. 이 설비는 별도의 설치공간을 필요로 하는데 GL강판의 경우 도금직후부터 15~20m거리 이내에서 급속 냉각을 실시하여야 하므로 상기와 같은 판안정화 장치를 15~20m이후에 설치할 수 밖에 없는데 이 때문에 스팽글 크기를 조정하는 구간에서는 목적하는 바를 달성할 수가 없다.On the other hand, in order to prevent the plate shake in the cooling process after plating, a conventional pressure pad has been devised and applied, but the plate stabilization device using the electromagnetic force has recently been developed because it does not have the effect of correcting the shaking of the plate. This equipment requires a separate installation space. In the case of GL steel, rapid cooling should be performed within 15 ~ 20m distance immediately after plating. Therefore, the plate stabilization device can only be installed after 15 ~ 20m. It is not possible to achieve the purpose in the section that adjusts.
따라서 GL강판 제조라인에서는 냉각대의 송풍기 풍량을 증대시켜 전체 냉각능력의 강화에 따른 스팽글 미세화로 가시적인 편차를 줄이는 방법이 적용되고 있다. 그러나 이 방법도 전체적인 스팽글 크기를 줄이는 효과는 있으나 국부적으로 발생되는 스팽글 편차 현상을 근본적으로 해결하지 못하기 때문에 도금층 내 아연과 알루미늄의 상 분산화의 효과가 미흡하고, 특히 일정 크기 이상의 스팽글을 선호하는 고객의 요구에는 본질적으로 부응할 수 없는 문제를 안고 있다.Therefore, in the GL steel manufacturing line, a method of reducing the visible deviation by increasing the air flow rate of the cooling unit and miniaturizing the sequins by strengthening the overall cooling capacity is applied. However, this method also has the effect of reducing the overall sequin size, but it does not fundamentally solve the locally generated sequinal deviation phenomenon, so the effect of phase dispersion of zinc and aluminum in the plating layer is insufficient. There is a problem that is inherently unmet.
따라서, 본 발명은 상기와 같은 문제점을 해결하기 위하여, 본 발명은 냉각대에서 폭방향 균열냉각이 효과적으로 이루어지는 헤드구조를 가질 뿐만 아니라 전 이면과 폭방향으로 공급되는 냉각가스량을 제어하여 전이면의 판치우침과 폭방향의 판흔들림 현상을 방지함으로써 전이면, 폭방향으로 균일한 스팽글이 형성되도록 하는데에 그 목적이 있다.Therefore, in order to solve the above problems, the present invention not only has a head structure in which the widthwise crack cooling is effectively performed in the cooling zone, but also controls the amount of cooling gas supplied in the front and rear sides of the front and rear plates. The purpose is to make uniform sequins in the width direction by preventing the blurring and the shaking of the plate in the width direction.
상기 목적을 달성하기 위하여, 본발명은 도금욕조 직상부에 설치된 냉각대의 노즐형상을 상하부로 2원화하여 도금 직후 냉각이 이루어지는 하부에는 스트레이트 형 노즐을 적용하여 폭방향으로 연속된 냉각유체가 강판표면에 접촉하도록 하므로써 냉각차에 따른 줄무늬 발생현상을 억제하고 상부 노즐헤드는 라운드형으로 적용하는 것을 요지로 한다. In order to achieve the above object, the present invention provides a cooling nozzle continuous in the width direction by applying a straight nozzle to the lower part where the nozzle shape of the cooling stand installed in the upper part of the plating bath is cooled to the upper and lower parts by the upper and lower parts. The contact is suppressed to cause the streaks caused by the cooling car and the top nozzle head is to be applied in a round shape.
또한 본 발명은 각 헤드에 공급되는 배관을 3등분하여 각기 배관 내에 전기적으로 제어되는 밸브를 설치하고 각 냉각대의 양 측면부에 카메라를 설치하여 진행되는 강판의 치우침 정도를 관찰하여 3등분된 배관 내의 제어밸브를 개별 작동시켜 강판이 전이면이나 폭방향으로 치우치는 현상이 발생되지 않도록 조정이 가능한 장치를 제공하는데에 특징이 있다. In addition, the present invention is divided into three parts of the pipe supplied to each head to install the electrically controlled valve in each pipe, and to install the cameras on both sides of each cooling stand to observe the degree of steel plate advancement to control the control in the pipe divided into three It is characterized by providing a device that can be adjusted so that the valves are operated individually so that the steel sheet is not biased in the front or width direction.
본 장치의 기능 및 작동원리를 첨부도면을 이용하여 구체적으로 설명을 하면, 다음과 같다.The function and principle of operation of the device will be described in detail with reference to the accompanying drawings.
먼저 스트립(S)이 도 1에서와 같이 도금욕조(3)를 통과하여 냉각탑으로 올라가게 되면, 가스 와이핑장치(5)에서 아연 등 도금 부착량을 조절하고 급속 냉각대(6)에서 -12℃/sec이하의 냉각속도로 냉각을 행하면 GL강판은 비로소 요구하는 최저수준의 내식성을 만족하는 도금층 구조를 얻게 된다. 이때 냉각대(6)에서는 도 3에서와 같이 냉각팬(9)이 외부공기를 끌어와서 상,하부의 냉각박스(10a~c)에 차가운 공기를 공급하여 냉각헤드(13,15)의 노즐(14,16)을 통해 스트립에 직접 분사함으로써 실현된다. (도 4참조)First, when the strip S rises to the cooling tower through the
스트립(S)은 도 2에서와 같이 가스 와이핑장치를 통과할 때 흔들림이 발생되거나 그 이전 도금욕조(3)내 침지롤(4)을 통과할 때 구동불량으로 인하여 또는 그 이전의 소둔공정에서 불균일한 가열에 따른 형상불량으로 인하여 흔들림이 발생될 요인을 안게 된다. 더구나 냉각탑은 50~70m로 매우 높고 그 중간에 지지하는 롤이 없기 때문에 도 2와 같이 냉각대를 통과하면서 미세한 차이로 인한 치우침이나 흔들거리는 현상이 발생하기 쉽다.As the strip S is shaken when passing through the gas wiping device as shown in FIG. 2 or when the strip S passes through the
작업자는 냉각대에 설치한 카메라(17)를 통해 운전실로 모니터링되는 스트립의 상태를 파악하여 강판이 전면 또는 이면으로 치우치는 현상이 발생할 경우 도 5에서와 같이 전이면 냉각헤드로 연결된 메인풍량조절밸브(12)의 개도(開度)를 조정하여 강판의 위치가 중앙으로 올 수있도록 조정하며, 강판이 폭방향으로 치우치는 현상이 발생할 경우에는 양단과 중앙의 냉각헤드로 연결된 배관의 풍량조절밸브를 조정하여 정중앙을 유지할 수 있도록 제어한다.When the operator grasps the state of the strip monitored by the cab through the
이러한 과정을 통해 스트립 표면의 스팽글이 폭방향이나 전이면으로 차이가 생기지 않도록 제어할 수 있다. Through this process, the sequins on the surface of the strip can be controlled so that there is no difference in the width direction or the front surface.
또한 냉각대에 분사된 차가운 공기는 강판에 부딪쳐 강판이 가지고 있던 잠열 빼앗아 데워지게 되므로 신속하게 외부로 배출할 수 있도록 냉각헤드(13,15)를 개방형으로 설치하고, 하부 냉각헤드부에서 폭향으로 분사되는 풍량의 차이에 의한 불균일 냉각(길이방향 줄무늬를 야기)이 일어나지 않도록 하부 노즐헤드(14)는 직선형으로, 상부 노즐헤드(16)는 라운드형으로 설치한다. 이때 상부 노즐헤더에 뚫린 냉각구멍은 상하 노즐헤드간 지그재그형으로 배치하도록 한다.In addition, since the cool air injected into the cooling stand hits the steel plate and takes away the latent heat of the steel plate, the cooling heads 13 and 15 are installed in an open type so that they can be quickly discharged to the outside. The
본 발명의 냉각장치는 아래의 효과를 가능하게 한다. The cooling apparatus of the present invention enables the following effects.
- 정해진 냉각대 구간 내에서 외기의 찬 공기가 강판의 잠열을 빼앗은 후 효과적으로 배출되므로 냉각성능이 향상되어 내식성이 우수한 아연-알루미늄 합금용융도금강판을 제조할 수 있다.-Cold air of outside air is effectively discharged after depriving the latent heat of the steel plate within the designated cooling zone section, so the cooling performance is improved, and it is possible to manufacture zinc-aluminum alloy hot-dip galvanized steel sheet with excellent corrosion resistance.
- 상기 성능을 발휘함으로써 냉각설비의 길이를 단축시키고 한정된 구간에서 냉각능력을 극대화시킴으로 생산속도의 증가를 통한 증산이 가능하도록 해준다.-By exerting the above-mentioned performance, it is possible to increase the production speed by increasing the production speed by shortening the length of the cooling equipment and maximizing the cooling capacity in a limited section.
- 폭방향으로 풍량을 제어함으로써 강판의 치우침이나 흔들림을 잡아주어 균일한 스팽글을 가지는 제품을 제조할 수 있다.-By controlling the air volume in the width direction, it is possible to manufacture products with uniform sequins by catching the skew or shake of the steel sheet.
- 도금직후 스트레이트형 냉각노즐을 적용하여 불균일 냉각에 의한 폭방향으로 스팽글 불균일이 없는 우수한 표면을 가지는 제품을 제조할 수 있다.-By applying a straight cooling nozzle immediately after plating, it is possible to manufacture a product having an excellent surface without sequin unevenness in the width direction due to uneven cooling.
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| KR20020052730A (en) * | 2000-12-26 | 2002-07-04 | 이구택 | Nozzle assembly in using the pre-cooler |
| KR20030048597A (en) * | 2001-12-12 | 2003-06-25 | 주식회사 포스코 | Apparatus for furnishing of steel sleeve |
| JP2004307904A (en) * | 2003-04-03 | 2004-11-04 | Nippon Steel Corp | Steel strip cooling unit |
| KR100524627B1 (en) | 2001-05-29 | 2005-11-02 | 주식회사 포스코 | A cooling stand which is opened a free cooler |
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| KR20020052730A (en) * | 2000-12-26 | 2002-07-04 | 이구택 | Nozzle assembly in using the pre-cooler |
| KR100524627B1 (en) | 2001-05-29 | 2005-11-02 | 주식회사 포스코 | A cooling stand which is opened a free cooler |
| KR20030048597A (en) * | 2001-12-12 | 2003-06-25 | 주식회사 포스코 | Apparatus for furnishing of steel sleeve |
| JP2004307904A (en) * | 2003-04-03 | 2004-11-04 | Nippon Steel Corp | Steel strip cooling unit |
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